I was helping a friend out with some links to virtual projection keyboard makers. Many of these are cool laser devices that draw a keyboard on the table in front of you and recognize where you put your fingers to capture keystrokes. These are small and really sexy travel add-ons for your PDA. In doing this research, however, I saw this input solution:

If nothing else, the guy on the plane next to you might get nervous as he prepares to be assimilated.